Malicious PDF — malware analysis report

Static analysis result for SHA-256 3590b250c083b52c…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 16:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9545826558f9d82ce2d220951c18be1 SHA-1: 5c2cd5ffb49d7e33aba275d44eed58d96ab96c39 SHA-256: 3590b250c083b52c58775ec9ab790d3595b4ecea9587aa258ca210b05ec96e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various websites, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to potentially malicious content or phishing pages. The presence of these external links and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=page+maker+software+free+download+for+windows+7
    • http://opakowania-loga.pl/zdjecia/fotki/file/vexawinegevi.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f80dff5c6bfa18877257f738a8136bb8/wegomisilokomigomisefiz.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/126103bfbb6dcbe7b646fcf9ab3bed7b/feponamemewivifuzafabe.pdf
    • https://airflow-skateboards.com/upload/file/40211973053.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56ad5a98b---palezuzujilu.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d463b564df---5670539053.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2fb1af2a---34897322316.pdf
    • https://contabil-fiscal.ro/mm/file/31703406006.pdf
    • http://aranykoronakft.hu/userfiles/file/sorurinonenuverovaweleso.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e5c53a3d1c6a522376162499bb461037/7708501058.pdf
    • http://allmedicus.com/userfiles/file/94027730002.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdab6d661---wetevufuzabazopuba.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/69602266002.pdf
    • http://ekotronic.eu/files/file/99659835489.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/do7s1s1f89ep3gnnoq7odv9g34/xabovegixomadupelewasaweb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16792 bytes
font_01_sfnt_off0000f983.bin
0079ef5100eec762e7f2488f5468b57e7e7dccdca9874d8229d4653fe15f9362		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10924 bytes
font_02_sfnt_off000112b4.bin
f6d1eb4d6e6dce568b2ad5daf1a478d3727ddfbf0bc5a33b7ae56cfbd658707b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 16904 bytes

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